Apparatus for cooling superheater-pipes.



P. THOMSEN. APPARATUS FOR COOLING SUPERHEATBR PIPES.

APPLICATION FILED MAY 14 1913.

Patented Sept. 2, 1913 2 SHEET8 SHEET 1.

INVENTOR BY w 1177mm mull/174% .1 C

WITNESSES ;&? 5 WW P. THOMSEN.

APPARATUS FOR COOLING SUPERHEATER PIPES.

APPLICATION FILED MAY 14, 1913 1 ,072,1 94, Patented Sept. 2, 1913.

2 SHEBTSSHEBT 2.

'IIIIIIIIIII IIIIII f WITNESSES urated hem fly; 91min; u i

TEE} PACKET neon.

PETER 'rnolvzsnn, o c ensignnqmwmisnozi i, onmemv, ASSiGNOR To sc'zmxn'rsfima HEISSDAMIF onsannaofiarr IVE. B. on cAssEn-WEHELMSHfiHE, GER-MANY, A.

COBEQBATION GP G k IVER N Y 2 CGGLING FZULERHEATEB-PIPES.

fiypiiontion filed. flay 14, 1913.

nenitlcatiou of Letters Patent.

To 0552 whom it may;

Be it known iluit L l subject of the King of Fm impel-or of Germany, residing at jfiiaeei engines having a short. vimnn no that a blower is necessary for in -am the :iz'n it. In engines of ti i ill t p-e the blower Oitiilm o isv ihe oxiuiuei from the engine oylimi 3, w ii; t when the engine is running! idle tron. 5 or is stm liO!lfil the blower HHSi h iiniitfii in ()i'tlt'i to r-xupi lly Hili'l'ltii at. iimf M imintuin the steam mpply. mien {he l: i thurzi crating al io with ii Hppiy (Hi there in, oi r no Aim 2 on. ing through the superheium' papw. stances, these pig's; and to burn out It is the ohjert, oi in provide n mixtur the sup:

. I to the ug i blower is runnh'ip; in m t r may be made suilivienti from burning out.

More mi-tieulo l iiivention to 1* i'hle =11 tain part of tin. stem-n l the blower pi; i tlivi" (ti 3 a s'temnheath-mini imp: imam n the superhenter peeto be rote: atmosphere through s uiinbln Llli-Hi! valves or other o 'wniugo.

Another ohje t ot' inv arrange the steam no" the pi pm prevented inv'izntion is to so ions to the eat- 7 in from the blower pipefis eurrietl thzit when the engine is running idle {coasting} sLil xiii be onto n'iatioaliyfilmwn into anti .tirouggit. the rupee heater pipes.

My invention wili he better uniierswofl by referring to the m mma-pa I in which the sov 1; emboo same are illusimt A preferred embodiment. of my invention shown in Figure 1, which is; a central YUP timl section through the end of a boiler equipped with my invention; Fig. 2 is n sink iini' view showing a modified form of my in.- vontion; and Fig. 3 is a View similar to Fig, i showing still another modification oi the invention.

Referring to Fig. 1, a boiler 11., a. smoke box Z and tube sheet 0 are arranged in the usual manner, ihe boiler being provided with :1 vermin number of enlarged fire tubes of in nhiiui are dispoe/ed superheater tul'ies e of known type. 'lhesze superheater pipes are vonnertetl to a steam header f comprising sniumtml and superheated steam chambers 1 a respectively, the. saturated steam entew g the saturated steam chamber 9 through 21 i inlet. opening 5 after having passed through a suitable pipe and throttle (not vhmz'ug. A tier passing through the Pauperneuter pi 'iee, the superheated steam is; com du'stml through pipe to the. engine eviixr (not. shown). bhmer pipe terminate: above the eyiinder exhaustpipe .1 in a 'h surrounds the aperture of said .1" pipe this ring, being, provided with ings m on its upper Rifle constituting mm; The blower supply pipe 7.: leaves ihe boiler at any convenient point and is pro- Yiilfil with a blower cock 0 by means of whivh the blower is controlled. At some suitable point the cock 0 and the outlets m a lrii'nneh connection m controlled by a valve i disposed. From some other point in the in or supply pipe 70 is a branch connection o rontrol ied by a check valve 1" anti opening into a pipe 1), this pipe opens into the ated steam chamber 7.

:5? operation of the arrangement; is as inlimvsr The steam supply to the engine cylii ie." heing out. off by closing the. main throttle, and the blower started by opening wit oi part of the steam which passes into pipe 5 through cock 0 will branch oti ks wives or other openings on the engine or on the steam su l T i )95 leadin thereto. T I w l P 3 P l, .5 i mg the normal working of the engine ihmugb the valve (,7 and ipe 77 into the sub.

the exhaust through ex produced solely by aust pipe I, the flow of steam through the superheater pipes is sufficient to prevent their overheating; in such cases, the blower is not used and the cock 0 is keptclosed. The check valve q prevents steam from the header passing back through pipe p and out through blower pipe is to the atmosphere. On first starting up, when there is, of course, no steam pressure in the boiler and hence no steam in the superheater pipes, the pipe r may be connected to any suitable supply of compressed air and the valve n opener This air will then flow through the superheater pipes and keep them cool.

In the modification shown in Fig. 2, the pipe 122 enters directly an air valve 8 which valve is itself fixed to the top of and opens into the saturated steam chamber 9 of the header. This air valve is of the type frequently provided on locomotives for preventing the formation of a vacuum in the cylinders and. in the slide valve chests when the when the draft is being engine is running with throttle closed. As

steam passes through pipe p into the valve 8, the arrangement acts like an injector and air is drawn through holes 6 so as to mix with the steam and pass into the steam chamber g and thence through the superheater tubes. The valve member u, when the throttle is open and normal steam pressure exists in chamber g closes and prevents any steam loss through the holes t to the atmosphere.

While the arrangement shown in Fig. 2 is somewhat more complicated than that shown in Fig. 1, it is, on the other hand, more ellicient, since the cooling effect of air drawn from the outer atmosphere is greater than that of steam taken from the boiler. A further advantage of the arrangement shown in Fig. 2 is that when the engine is coasting with regulator closed, it is not necessary to have the blower in operation, as the suction of the engine cylinders causes a 'sutficient quantity of cold air to be drawn through the air valve into the superheater.

The use of a single valve upon the header, instead of a valve on each cylinder prevents the formation of a vacuum on the cylinder just as effectively and has the additional advantage that smoke and dirt from the exhaust pipe cannot be drawn into the cylinders and into the valve chest.

F ig. 3 shows still a third form of my invention. This is very similar to the construction shojyv gip'Fig. 2, but has the advantage that only one check valve is required for preventingboiler steam from escaping when the throttle is open. In this form, When the blower is operated with the throttle open, a portion of the medium for operating the blower escapes from the blower pipe through the branch ipe p and the apertures 19; the loss due: to t is is, however, quite small.-

In all of the several forms above described,

it is not essential that the branch from the blower pipe shall open directly into the saturated steam chamber, as the same result will be attained if said branch opens at any other convenient point between the throttle and the saturated ends of the superhcater pipes.

The crom section of the drain cocks or air valves through which the steam passes into the atmosphere after having gone through the super-heater pipes must obviously be suiliciently great to prevent such an increase of pressure in the valve chest or cylinder as might possibly cause the engine to start up. This crow section should obviously be greater than the cross section of the blower pipe.

Having described In inventiou l claim:

1. In a boiler provi ed with fire tubes, in combination, superheater tubes in some of said lire tubes adapted to have their steam supply cut oil, a blower pipe connected with the boiler by a cock and provided with a nozzle, a branch pipe opening from the blower pipe between said cock and nozzle and joined to the saturated end of the superheater elements, and a check'valve controlling said branch pipe. v

'2. In a boiler provided with fire tubes, in combination, superheater tubes in some of said fire tubes adapted to have. their steam supply cut off, a blower pipe connected with the boiler by a cock and provided with a nozzle, a branch pipe opening from the blower pipe between said cock and nozzle and joined to the saturated end of the super heater elements, a check valve controlling said branch pipe, and a second branch connection from the blower pipe adapted to be joined to a pressure source other than the boiler.

3. In a boiler provided with fire tubcsuin combination, suporhcatcr tubes in some of said fire tubes adapted to have their steam supply cut otl, a blower pipe connected with the boiler by a cock and provided with a nozzle, a branch pipe. opening from the blower pipe between said cock and nozzle and joined to the saturated end of the super heater elements. air inlet passages in said branch pipe, and a check valve between said passages and the super-heater elements for controlling thebrsnch pi e.

In testimony whereof, my hand in the presence of two subscribing witnesses.

' PETER THOMSEN. [u a] \Vitnesses:

CARL Morin, lViLncLM Snuznrvnnnosn.

have "hereunto set 

